John fell asleep ___he was listening to the musicA afterB beforeC whileD until

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Johnfellasleep___hewaslisteningtothemusicAafterBbeforeCwhileDuntilJohnfellasleep___hewaslisteningtot

John fell asleep ___he was listening to the musicA afterB beforeC whileD until
John fell asleep ___he was listening to the music
A after
B before
C while
D until

John fell asleep ___he was listening to the musicA afterB beforeC whileD until
选C,约翰听着音乐入睡了~
while表示状态是伴随进行的,他在听音乐的时候不知不觉睡着了